This position is posted by Jobgether on behalf of IONA. We are currently looking for a Senior Full-Stack Developer in United Kingdom. We are seeking a hands-on and experienced Senior Full-Stack Developer to join a dynamic international team working on next-generation commerce solutions. In this role, you will design and build scalable applications, drive architectural decisions, and take ownership from concept through to deployment and long-term maintenance. You will collaborate directly with clients, providing technical leadership while ensuring quality, performance, and security. This is an opportunity to work with modern technologies in a consultative environment, contribute to innovative digital commerce platforms, and mentor other developers in a supportive, growth-driven culture. Accountabilities: • Design, develop, and implement new applications while maintaining and improving existing ones • Write, test, and debug code while ensuring quality through automated testing and CI/CD pipelines • Troubleshoot issues across multiple platforms, environments, and cloud architectures • Build integrations between internal systems, third-party services, and client platforms • Ensure application performance, scalability, and security at all stages of development • Provide technical leadership in projects, working closely with client stakeholders in a consultative role • Mentor and support other developers, reviewing code and promoting best practices Requirements • Senior-level programming experience, with strong knowledge of modern API-based SaaS and responsive web solutions • Solid understanding of the full software development lifecycle and experience with headless ecommerce platforms (commercetools preferred) • Experience with headless CMSs such as Contentful, Sanity, or ContentStack • Strong expertise in JavaScript technologies (Next.js, React, Node), SaaS services, and cloud platforms (AWS, Azure, GCP) • Skilled in CI/CD workflows, automated testing frameworks, and version control systems • Strong knowledge of integrations, APIs, and cloud-based data pipelines • Excellent communication skills in written and spoken English, able to explain technical concepts to diverse audiences • Experience working in cross-functional teams with designers, product managers, and developers Nice to Have: • Knowledge of application and cloud security practices • Interest or skills in project management, UX design, or quality assurance • Experience with advanced ecommerce integrations such as payment gateways, ERP systems, or marketing automation Benefits • Competitive salary and performance incentives • Opportunity to work with cutting-edge technologies in an international environment • Professional development and continuous learning support • Inclusive and diverse workplace culture that values teamwork, curiosity, and integrity • Exposure to global clients and innovative digital commerce projects Jobgether is a Talent Matching Platform that partners with companies worldwide to efficiently connect top talent with the right opportunities through AI-driven job matching. When you apply, your profile goes through our AI-powered screening process designed to identify top talent efficiently and fairly: 🔍 Our AI evaluates your CV and LinkedIn profile thoroughly, analyzing your skills, experience and achievements. 📊 It compares your profile to the job's core requirements and past success factors to determine your match score. 🎯 Based on this analysis, we automatically shortlist the 3 candidates with the highest match to the role. 🧠 When necessary, our human team may perform an additional manual review to ensure no strong profile is missed. The process is transparent, skills-based, and free of bias — focusing solely on your fit for the role. Once the shortlist is completed, we share it directly with the company that owns the job opening. The final decision and next steps (such as interviews or additional assessments) are then made by their internal hiring team. Thank you for your interest!